Micrometer



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Oct. 21, 1952 2,614,331

C. F. SHERWIN MICROMETER Filed July 24, 1951 2% 26732 2/ /20 f2/ /f /9 /20 Y fl" k k ff mm, \`\k\ A /27 Ver? tor l C/e s er F eF//z//N by Mud Patented Oct. 21, l1952 MioaoMsfrnii f chester n Sherwin, Waarheen.ad.; Application July 24,1951, seriaiNefzj'aaeii u '7 Claims. (Cl. Sli-164i) `1 i vIhis invention relates to measuring in`struments and, more particularly, to micrometer cali-v pers, preferably adapted for external use, as well as internal use, having a slidable, graduated or scaled sleeve of novel construction and function, the provision of such an instrument is ncipal object of the invention.

@Whe-rally, it is an object of the invention to provide such an instrument which is simple yet sturdy and durable of construction, economic of manufacture, which will operate withrelative freedom from wear and tear and other mechanical difficulties and, in particular, has many adsuch as, for example, they fact that constant addition and subtraction lduring use isi substantially eliminated, speed of production is increased, errors can be eliminated byproper use, and the instrument of my invention also aids considerably in eliminating eyestrain, especially where older operators are concerned.

More speciically, it is an object of the invention to provide such an instrument having an open-ended frame with an anvil portion y and a spindle portion, a spindle carrying sleeve having a spindle movablymounted therein, a slidable sleeve having a suitable longitudinally disposed scale thereon, mounted on the spindle carrying sleeve, and a thimble, lhaving a peripherally disposed regular scale, connected to the spindle and rotatably mounted on the slidn able sleeve and adapted to move'ldngitudinally thereof in order that bothv scales cooperatively can be arranged to indicate measurement.

More specific objects of the invention are to provide such instruments in which the slidable sleeve has suitable means thereon to lock the same in any predetermined position along the spindle carrying sleeve; in which the exposed end of the slidable sleeve has a tapered portion which is longitudinally slotted to adapt the sleeve to be compressed in locked position by the locking means against the spindle; in which the exposed end of the spindle sleeve has a threaded portion with longitudinally arranged slots to adapt the same to be cohipressed'in locked position against the spindle sleeve, the locking means being composed of a lock nut mounting the threaded portion of the sildable sleeve; in which the slidable sleeve has a stop element thereon, located at a point lying along the line circumferentially deining the beginningoithejscale on the slidable sleeve, and adapted to abut the edge of the thimble when the latter has been set at a predetermined point; and `invvlflich the slidable sleeve and the spindle holding portion have relatively engageable means, for example, a lug and notch arrangement, for locating the slidable sleeve in proper position, 'prior"to`setting theythimble, whereby subsequently tocooperatively associate the thimble and theslidable sleeve.

Other objectsofv theiinvention will in part be obvious andfwill 'inpart appear hereinafter.

The invention accordingly Ycomprises anrarticle of I manufacture possessing the features, properties, and the lrelation of elements which will be exemplified lin the article hereinafter described and the rscope of the application of which will be indicated in the claims. Y' l For a fuller understandng of the nature' and objects o f the invention 'reference should be had to 'the followingrdetailed-'description taken in connection with the laccompanying drawing, in Vlhch: Y', ."2 Y

Fig.r 1 is an elevationalf'view, with a portion broken away, illustrating a preferred embodiment cfthe invention;

Fig. 2is a detailview oa spindle; Fig. 31 is a somewhat enlargediview, partly in section and with parts broken away, of a gripping portion of the instrument shown in Fig..y 1 and illustrating the relative assembly of parts embodying the inventionr r i Figjl yis a`p'ersp'e`ctiv'e` view illustrating the chief ieatureofthe invention, namely, the slidable sleeve with-lockingmeans and other elements,` mounted 1 on` the spindle carrying sleeve projecting from' the' spindleportion of such an instrument/and J I.

Figs'. 5,-` 6 and A'7 illustrate the'pertinent por.

tionsofrsuch aninstrument depicted above dem onstrating the various'steps for setting Aan utilizing the'device during operation. y

Referring more particularly to the drawing, there is4 generallyf'indicated at/Iilin Fig. 1 a micrometer .caliper of, Vthe external measuring type'. This comprisesA anopenfended framell terminating in an,l anvil'I portion I2 -and having an anvil I3'v at one end, and terminating at its other;v end in a spindle portion I4. A

A spindle carrying sleeve I5 lprojects from, the spindle carrying portio-nJA as is customary in conventional instrumentslof this type. Howeven-suchA sleeves aregprovided With a suitable longitudinally arranged scale ofthe Vernier type, but in my invention ;as illustrated in the drawing no such graduation ory scale is needed or utilized -on the spindle carrying v sleeve I5. Mounted Within the spindlecarrying sleeve is a spindle I6 having an intermediate threaded portion ,Il and*v a threaded portion -i8 at one end opposite the measuringend; The spindle carrying sleeve is internally threaded as at I9 and adapted to receive the threaded portion of the spindle, which spindle is tightly secured to the thimble 20 by means of the threaded portion I8 which is located in the head of the thimble which is internally threaded to receive the same.

Now, referring in particular to IFig. 4, there are shown the novel structures constituting my invention. These comprise a slidable sleeve 2|, having suitable graduations longitudinally arranged thereon as a Vernier scale indicated generally at 22. This slidable sleeve ismounted on the spindle carrying sleeve I5. At the inner or exposed free end of the slidable sleeve there is provided locking means indicated generally at 23.

The preferred arrangement of such means comprises an internally threaded locking ring, or nut 24, which is suitably knurled around its periphery as at 25. Preferably, the free end of the sliding sleeve 2| on which the locking means is mounted, is tapered and threaded as at 26 and this tapered portion is providedI with one or more longitudinally arranged slots 21 in order that the slidable sleeve 2| can be compressed and locked in any predetermined or selected position against the spindle carrying sleeve I5.

A stop element 28 is provided on the slidable sleeve 2|. This element preferably is located at a point lying along aline circumferentially deiining the beginning of the scale on the slidable sleeve and is adapted to abut the edge of the thimble when the latter has been set at a predetermined point as will more fully appear hereinafter.

Preferably, there is also provided cooperatively engageable locating means for the slidable sleeve and these may take the form of a lug 23 on the spindle carrying portion and a notch 3D on the free end of the tapered portion of the sleeve as at 30. This lug and notch arrangement is utilized for locating the slidable sleeve in proper position, prior to setting the thimble in order subsequently to associate the thimble and the slidable sleeve also as will more fully appear hereinafter.

In operation, assume that a piece of stock such as, for example, a shaft indicated in dotted lines as at 3| measures somewhat in excess of 1/2", i. e., 0.520, and it is desired to turn down or grind such shaft exactly to 1A", i. e. 0.500", the thimble 20, and consequently the spindle |6, is backed up as illustrated in Fig. until the shaft 3| to be turned down or ground is measured therebetween. It will be observed that the lugs 30 and 21 are still cooperatively associated together so that the scale 32 is in proper position. The locking ring, or nut 24, is then loosened and the slidable sleeve 2| is moved along the spindle carrying sleeve l5 longitudinally thereof until the stop element 28 abuts the end of the thimble as shown in Fig. 6. It will be observed that the thimble which is of the conventional type, is also provided around its tapered portion 32 with a circular scale indicated at 33. When the slidable sleeve 2| has been moved along the sleeve l5, the zero mark thereon should be made to correspond with the zero mark on the scale 33, the latter scale being divided into 25 parts. The locking ring 24 is then tightened so that the slidable sleeve is secured in position against the spindle carrying sleeve I5 and the instrument will be set at 1/2". i. e. 0.500". In other words, the distance between the anvil and the measuring end of the spindle will be spaced apart that distance which is the ultimate size to which the shaft 3| is to be turned or ground down. By backing up @he thimble and actually measuring the shaft, it will be seen that the reading will be at 20 as in Fig. 7 showing that the Work piece 3| is 0.020 thousandth oversize. As the turning or grinding proceeds the piece can, from time to time, be measured or miked and the thimble advanced in order to determine how much stock is being rcmoved. When the thimble again approaches or abuts the stop 28, it cannot be moved any further and the ultimate size, that is, 0.500 will have been reached.

VIt will thus be seen that the objects hereinbe- `fore set forth may readily and eniciently be attained, and since certain changes may be made in the above article and different embodiments of the invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting.r sense.

It is also to be understood that the following claims are intended to cover all of the generic and specic features on the invention herein described, and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

Having described my invention what I claim as new and desire to secure by Letters Patent is:

l. In a micrometer caliper, the combination comprising an open-ended frame having an anvil portion and a spindle portion; a spindle carrying sleeve projecting from said spindle portion and having a spindle movably mounted therein; a slidable sleeve, having a Vernier scale thereon, mounted on said spindle carrying sleeve; and a thimble, having a peripherally disposed regular scale, connected to said spindle and rotatably mounted on said slida-ble sleeve, and adapted to move longitudinally thereof, whereby said scales cooperatively can be associated to indicate measurement.

2. In a micrometer caliper, the combination comprising an open-ended frame having an anvil portion and a spindle portion; a spindle carrying sleeve projecting from said spindle portion and having a spindle movably mounted therein; a slidable sleeve, having a Vernier scale theron, mounted on said spindle carrying sleeve, said slidable sleeve having means thereon to lock the same in any predetermined position along said spindle carrying sleeve.

3. In a micrometer as set forth in claim 2 and further characterized in that the exposed end of said slidable sleeve constitutes a tapered portion, and said tapered portion being longitudinally slotted to adapt the same to be compressed in locked position by said locking means against said spindle sleeve means.

4. In a micrometer as set forth in claim 2, and further characterized in that the exposed end of said slidable sleeve constitutes a threaded portion, said threaded portion being longitudinally slotted to adapt the same to be compressed in locked position aginst said spindle sleeve, and said locking means consisting of a lock nut mounting said threaded, slotted portion of the slidable sleeve.

5. In a micrometer as set forth in claim 2, and further characterized in that said slidable sleeve has a stop element thereon located at a point lying along a line circumferentially defining the beginning of the scale on said slidable sleeve, and adapted to abut the edge of a thimble when the latter has been set at a predetermined point.

6. In a micrometer caliper, the combination comprising an open-ended frame having an anvil portion and a spindle portion; a spindle carrying sleeve projecting from said spindle portion and having a spindle movably mounted therein; a

slidable sleeve, having a, Vernier scale thereon,

mounted on said spindle carrying sleeve, said slidable sleeve having means thereon to lock the same in any predetermined position along said spindle carrying sleeve, said slidable sleeve and said spindle holding portion having cooperatively engageable means thereon for locating said sildable sleeve in proper position. prior to setting said thimble, whereby subsequently cooperatively to associate said thimble and said slidable sleeve.

7. In a micrometer as setQforth in claim 6, and further characterized in that saidcooperatively engageable means comprises a lug on said spindle holding means and a notch on said slidable sleeve adapted to receive said 1ug..

CHESTER F. SHERWIN.

No references cited. 

